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  1 extraction
     The optimum extraction conditions for spirmycin are 5.0% N 1923 , pH 9.56, O/A=1∶1, extraction rate is 90.5%, that for erythromycin are 7.5% N 1923 , pH 9.50, O/A=1∶1, extraction rate is 91.0%.
     经优化的萃取条件如下 :对螺旋霉素用5 .0 % N1 92 3,p H9.5 6 ,O/ A=1∶ 1,萃取率为 90 .5 % ; 萃取红霉素用 7.5 % N1 92 3,p H 9.5 0 ,O/ A=1∶ 1,萃取率为91.0 %。
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     The reaction product was extracted for dehydration by saturated KAc, using 3% K2CO3 as neutraliz-er, 0.4:1 extraction ratio, room temperature, and two stages extraction.
     产物粗酯用醋酸钾溶液(质量分数大于60%)萃取脱水,添加3%的K2CO3为中和剂,萃取比为0.4:1,萃取温度为室温,逆流2级萃取。
短句来源
     The solution was extracted by an organic phase consisted of 1% P_(507)~+ kerosene, phase ratio of 1:1,extraction 15min. Extraction rate was over 90%.
     以1%P507+煤油为有机相,相比O/A=1∶1,萃取时间15min,钪的萃取率达90%以上。
短句来源
     The new technique of preparing high pure-low fluorin niobium oxide from hydroxide niobium by extraction method was studied. The article discusses the effects of technical factors on the quality of product. When the better technical conditions are as follows: the ratio of extraction agent to water of 1:1,extraction time of 20 minutes,washing times of 10,calcination temperature of 800 ℃ which was achieved according to the results of perpendicularity experiment,the fluorine content of niobium oxide was under 7 ppm.
     以氢氧化铌为原料,研究了萃取法制备高纯低氟氧化铌的新工艺,讨论了工艺条件对产品质量的影响,由正交试验得出较佳工艺条件为萃取剂和水比为11,萃取时间为20min,洗涤次数10次,煅烧温度800℃.
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  “1萃取”译为未确定词的双语例句
     RESULTS:The calibration curve was linear within the range of 0.25~32 μg·ml 1 .The recoveries of extraction were 96.1%~100.3%.
     结果:线性范围0.25~32μg·ml-1,萃取回收率96.1%~100.3%。
短句来源
     the linear relation was in the range of 0.5- 100.0 mg·L -1 the recovery of extraction was 82.95%- 86.25%; the recovery of methodology was 98.05%- 101.03%; the RSD for within-day and between-day were 4.29%- 9.83% and 5.21%- 10.57%, respectively.
     结果:头孢吡肟的保留时间为6.82min,最低定量限为0.5mg·L-1,线性范围0.5~100.0mg·L-1,萃取回收率82.95%~86.25%,方法回收率98.05%~101.03%,日内RSD4.29%~9.83%,日间RSD5.21%~10.57%。
短句来源
     The optimal experimental parameters were25MPa extraction pressure, 95% alcohol concentration, 6:1 solid-liquid ratio, 50℃ extraction temperature, 4h extraction timeand 35kg/h fluid velocity.
     最佳萃取实验工艺条件为:萃取压力:25MPa,乙醇浓度95%,固液比:6:1,萃取温度为500C,萃取时间为4h,流体流速为35kg/h。
短句来源
     RESULTS:The linear range was 3~100 ng·ml -1 ,r= 0.9997 .The recovery rate of high,middle ,low concentration were 89.42 %, 90.66 %, 83.50 % (n=4),coefficients of inter-day and intra-day variations were 1.02% , 2.74% , 3.21% and 2.52% , 3.74% , 3.77% (n=4).
     结果 :3种浓度 3 ,5 0 ,10 0ng·ml-1萃取回收率分别为 83 .5 0 % ,90 .66% ,89.4 2 % ; 日内、日间RSD分别为 3 .2 1% ,2 .74 % ,1.0 2 %及 3 .77% ,3 .74 % ,2 .5 2 % (n =4 )。
短句来源
     The optimal extraction condition is organic phase composition of 10% P204+90% kerosene,saponification rate 70%,ambient temperature,phase ratio(O/A)=1/10,equilibrium aqueous phase pH=3~3.1,7 stages of counter-current extraction,and equilibration time 5min.
     优化出的萃取工艺条件为有机相组成为10%P204+90%煤油(体积百分数),皂化率70%,室温,相比(O/A)=1/10,出口水相pH=3~3.1,萃取级数为7级,每级混合时间5min。
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     1 |C|Wc (w,Y0,...,Ys ),where?
     1?
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     1.Preparation of E.
     1.E.
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     1 Design of the extraction device.
     1萃取装置的设计。
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  1 extraction
Group 1 (extraction drilled) received 9?mm diameter tunnels.
      
In L2, extraction was essentially limited to the upper 0.4 m, while L1 extraction was to 0.8 m depth.
      
Bioaccessible As was determined at time 0 (immediately after spiking), and at 6 and 12 months of equilibration using an in vitro gastrointestinal test, and As phytoavailability was measured with a 1-M KC1 extraction test.
      
Two methods were used: (1) extraction of Zn by water, dilute CaCl2 and HCl solution and (2) using pecan limb segments with introduced (at midpoint) Zn-B where the Zn was leached by dilute CaCl2 solution forced under pressure through limb sections.
      
Ates 3.1 Extraction of Related Phrases Finding sets of co -occurring phrases that are pertinent to a hidden phrase is a very important issue.
      
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A new method for the separation of traces of rhenium by the method ofcoprecipitation has been proposed. It was successfully applied to the deter-mination of rhenium in molybdenite, which compared well with the well-knowndistillation method and the extraction method in accuracy and precision. From 10 to 100 micrograms of rhenium as perrhenate are completelycoprecipitated with tetraphenyl arsonium perchlorate obtained from about 0.4ml of 1% potassium perchlorate solution and 3 ml of 0.7% tetraphenyl arson-ium...

A new method for the separation of traces of rhenium by the method ofcoprecipitation has been proposed. It was successfully applied to the deter-mination of rhenium in molybdenite, which compared well with the well-knowndistillation method and the extraction method in accuracy and precision. From 10 to 100 micrograms of rhenium as perrhenate are completelycoprecipitated with tetraphenyl arsonium perchlorate obtained from about 0.4ml of 1% potassium perchlorate solution and 3 ml of 0.7% tetraphenyl arson-ium chloride solution. Precipitation can be carried out in either neutral, acid(hydrohloric or tartaric acid) or alkaline solution (sodium bicarbonate, car-bonate, hydroxide or ammonia). The recovery of rhenium is above 99%. When coprecipitation is carried out in about 50 ml. of solution containingone gram each of sodium chloride and sodium hydroxide and the precipitatewashed with 0.5% sodium hydroxide containing tetraphenyl arsonium chloride,perrhenate can be separated from considerable amounts of molybdate, unlessthe quantity of molybdenium exceeds 0.88 gm. In the latter case, the washedprecipitate can be made free from molybdate by dissolving it in hot water,adding more tetraphenyl arsonium chloride and potassium perchlorate solutionsand cooling the mixture to room temperature. Under these conditions, otheranions--zincate, aluminate, nitrate, phosphate, arsenite, arsenate, vanadate, sele-nite, chromite, chromate and tungstate--do not interfere. By dissolving the precipitate in hot water, adding an excess of perchloricacid and cooling, rhenium can be brought into solution. A modified procedurefor the colorimetric determination of rhenium by the Geilmann reaction in thepresence of perchloric acid is developed. Up to 50 micrograms of rhenium canbe separated and determined. A method for the determination of rhenium in molybdenite is proposed.Recommended procedure is as follows: A sample of molybdenite is weighed out so as to contain 10--50 microgramsof rhenium. It is fused with sodium hydroxide and sodium peroxide accor- ding to the method of Malouf and White. The aqueous extract of the melt(about 50 ml) is filtered from the ferric hydroxide precipitate and washed withhot water. The solution is then partially neutralized with hydrorhloric acid,leaving 1--2 gm of sodium hydroxide in solution. Three ml of 0.7% tetraph-enyl arsonium chloride solution are added, followed by seven drops (ca 0.4 ml)of 1% potassium perchlorate solution, added drop by drop during a period ofthree to four minutes. After standing ten minutes, the precipitate is filteredand washed four times with a 0.5% sodium hydroxide solution containing 0.014%tetraphenyl arsonium chloride. The precipitate is washed back with distilled water into the beaker inwhich precipitation was carried out. After adding water to about 50 ml andheating to dissolve the precipitate, 1 gm each of sodium chloride and sodiumhydroxide are dissolved therein and 2 ml of the tetraphenyl arsonium chloridesolution are added. One drop of potassium perchlorate solution is added aftercooling and the mixture is allowed to stand for ten minutes. The precipitateis filtered through the original filter and washed four times with the samewash solution. The precipitate is again washed back to the original beaker with distilledwater and more water is added to about 35 m1. The mixture is heated untilthe precipitate is completely dissolved and 1 ml of 60% perchloric acid is added.After cooling, the precipitate is filtered and washed with 1 : 100 perchloric acid.In this way, perrhenate in the precipitate can be brought into solution. The colorimetric determination of rhenium is essentially that of Hurd andBabler, with modifications. To the combined filtrate and washings whichcontains about 1 ml of eoncentrated perchloric acid in a volume 45--55 ml, areadded 3.5 ml of concentrated hydrochloric acid, 2 ml of 20% sodium thiocyan-ate solution and 1 ml of 20% stannous chloride in 1 : 1 hydrochloric acid. Afterten minutes, the solution is extracted with three portions of ether. The extra-cts are transferred into a 35 ml (or 50 ml) volumetric flask and diluted to themark. The optical density of the ether extract is then measured with anelectrophotometer using a blue (350--500 mμ) filter. Four samples of molybdenite were analyzed by this method and also by thedistillation method of Hiskey and Meloche and the extraction method ofBeeston and Lewis. The results are given in the last table of the Chinesetext. An analysis by this method requires about 2(1/4) hours.

从酸性、中性或碱性溶液里,微量高铼酸根都可以相当完全和高氯酸四苯基鉮共沉淀。在碱性溶液中,用共沉淀法可使微量高铼酸根与大量钼酸根及其他阴离子分离。如果钼的含量特别大.再沉淀一次可使分离完全。将沉淀溶解於热水後加入高氯酸,可使其中的高铼酸转入溶液,并可直接进行比色测定。本文提出一种简单、迅速而易於控制的新方法以测定辉钼矿中的铼。精密度与准确度与蒸馏法、萃取法接近。

In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01...

In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01 mm.Photographic plate, NIKFI Ⅱ. Using the line pairs (La 4333.74)/(Ce 4330.90'), (Pr 4225.33)/(Ce 4229.63'), (Nd 4061.09)/(Ce 4057.30) and (Y 4374.94)/(Ce 4376.88')La, Pr, Nd & Y can be determined quantitatively in the concentration ranges0.055--0.62%, 0.089--1.29%, 0.052%--0.59% and 0.025--0.40% respectively. Theroot mean square deviations of single determination amount to ±4.7%, ±10.8%,±7.0% and ±7.0% respectively. (2) For cerium samples of high purity, ether extraction is used to removemost of the cerium so that the rare-earth impurities can be concentrated. Becauseof its relatively simple spectrum, the element Y has been used as carrier and in-ternal standard. The concentrate, also in the form of chloride solution (concentration1 mg rare-earth oxides/ml), is excited and photographed by the same method asmentioned in (1) The line pairs used are: (La 4238.38)/(Y 4235.73'), (La 3988.52)/(Y 3951.60'), (Pr 4222.98)/(Y 4235.73) and (Nd 4232.38)/(Y 4235.73')With a sample of 100 mg (1 mg Y_2O_3 added as internal standard), the analyticalsensitivities reach 0.01%, 0.025% and 0.028% for La, Pr and Nd respectively. Theerror of the method amounts to about ±10%.

本工作报告铈中杂质镧、镨,钕及钇的两种光谱测定方法。(1)将试样的氯化物溶液滴于经液体石腊处理过的碳电极上,干燥后以交流电弧激发进行摄谱。采用线对 La 4333.74/Ce 43330.90,Pr 4225.33/Ce4229.63,Nd 4061.09/Ce 4057.30及Y 4374.94/Ce 4376.88时测定灵敏度分别可达0.055%,0.089%,0.052%,0.025%。单次摄谱的均方误差分别为±4.7%,±10.8%,±7.0%及±7.0%。 (2)对于较纯的铈,则采用乙醚萃取先行分离,以浓缩其中所含的杂质,并采用谱线较少的元素钇作内标及载体,以补偿分离过程中损失。浓缩物仍以氯化物溶液状态用上述的激发方法进行摄谱。采用下列线对: La 4238.38/Y 4235.73,La 3988.52/Y 3951.60,Pr 4222.98/Y 4235.73,Nd 4232.38/Y 4235.73取样100毫克时,镧、镨及钕的测定灵敏度分别可达0,01%;0.025%及0.028%。一般误差约在±10%左右。

In a neural bicarbonate buffer solution, containing 1.2M NaCl, Ge(Ⅳ) gives a well defined irreversible wave with E_(1/2) at 26.5℃—1.42V(vs.S. C.E.). This wave can be used for polarographic determination of Ge(Ⅳ) with concentration range of 10—5000γ Ge per 10ml. solution. Experimental conditions and interfering ions are discussed.

在含有1.2M NaCl及0.07M的NaHCO_3缓冲溶液中(pH=7左右)Ge(Ⅳ)产生波形良好的不可逆波,半波电位在26.5℃时为—1.42V(vs.S.C.E.),pH由7.25改变至8.40波高不变,E_(1/2)变动也较小,pH>9波形交斜,波高降低。NaCl浓度由1.0M改变至1.4M波高基本上不变,NaCl浓度在1.6M以上时,波高显著地升高。这个波可用作锗的极谱测定,浓度范围10γ/10ml至5000γ/10ml.Sn(Ⅳ),Sb(Ⅲ)干扰Ge(Ⅳ)的测定,如果它们存在时,要用CCl_4萃取法使Ge(Ⅳ)和它们分离,As(Ⅲ)的含量为Ge(Ⅳ)量一百倍时不干扰测定,大量砷存在时要用蒸馏法(在30%H_2O,存在下)使Ge(Ⅳ)与As(Ⅲ)分离。

 
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